Usually it means "explosion."
"Five people were killed in a blast yesterday."
It can be used to show you had fun.
"I had a blast swimming yesterday."
It can be used to show anger (substitute of words like "damn"):
"Blast! I left my phone in the car."

Other questions about "Blast"

“In charge” refers to having control-> who is in charge here? The Boss is!”
She is in charge of her happiness-> Michelle Obama is in control of what or who makes her happy because of how she reacts to a situation
Self-arrest is rarely used but it is a term that means she stopped her self and changed something
In this context she changed her mindset and thoughts into being able to change her emotions when ever she wanted, changing for the better

Immediately thought of "Pass the aux" (google it, it's a meme)
Warning: Slang incoming, this is a super casual situation, it's also using "young people" language so be aware of that.
[You're in a car with your friends]
You: "Yo put something on blast real quick"
Friend: "I gotchu with the flames"
*puts on a good song*
You: "Oh this shit is HEAT"
Side note, look at what Google keyboard suggested when I typed "immediately". ???

It means that someone is trying to stay current or important during the situation at hand.
So Trump is saying Steyer he’s trying to keep up to date, persistent or a prominent figure in the impeachment of Trump.

I my experience, there is a downside to having a blast scuba diving in Galapagos as you might have trouble choosing next destination to go for it.
I had so much fun scuba diving in Galapagos as everyone should have, now it's not easy to choose the next destination